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Restructuring-Related Expenses - Schedule of Restructuring-Related Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restructuring-related expenses    
Expenses $ 152.3 $ 36.8 [1]
Total expenses, net of tax   31.5
Cost of Services    
Restructuring-related expenses    
Expenses   4.5
Selling, General and Administrative    
Restructuring-related expenses    
Expenses   $ 32.3
[1] Non-cash benefits/(charges) include non-cash write-offs and accelerated depreciation of right-of-use ("ROU") assets and leasehold improvements and a non-cash benefit for adjustments to stock compensation for awards forfeited by employees. These amounts have been removed from the liability balance in the table above as they do not impact the restructuring accruals.